We built a meters composite depth (mcd) scale (as defined in "Composite Section" in the "Explanatory Notes" chapter) that ranges from 0 to 852 mcd and spans the entire cored sequence. Because Site 1148 was only double cored (Holes 1148A and 1148B), aligned core recovery gaps are common throughout the sequence. Thus, the mcd scale is discontinuous ("floating") and is not linked to the sediment/water interface. However, we were able to construct a short floating splice that extends from Sample 184-1148B-5H-5, 32 cm, to the bottom of Core 184-1148A-16H (from 46.57 to 155.34 mcd). Core recovery gaps both above and below this interval precluded the construction of a longer splice. Nevertheless, a continuous mcd and splice can be constructed—not for the site but for the local region—if data from Site 1148 are combined with data from nearby Site 1147. A continuous mcd and splice, extending from 0 to 155.34 mcd, can be assembled by combining the interval from 0 to 49.22 mcd from Site 1147 to the interval from 46.57 to 155.34 mcd at Site 1148. The splicing is accomplished by tying Sample 184-1147C-6H-4, 112 cm, at 49.22 mcd to Sample 184-1148B-5H-5, 32 cm, at 46.57 mcd.
The mcd scale and splice at Site 1148 are based on the stratigraphic correlation of whole-core multisensor track (MST) and split-core color spectral reflectance (CSR) data (lightness, L*) collected at 4- to 5-cm intervals (see "Physical Properties", for details). From the MST, we used magnetic susceptibility (MS), gamma-ray attenuation (GRA) bulk density, and natural gamma radiation (NGR) data. These data and the splice constructed from them are presented on the mcd scale in Figures F1, F2, F3, and F4 (also as Synergy Software KaleidaGraph plots and Microsoft Excel data files [see the "Supplementary Materials" contents list]; the spliced records are also available in ASCII format). The depth offsets that comprise the mcd scale are given in Table T3 (also in ASCII format). The splice tie points (Table T4, also in ASCII format) should be used as a guide for detailed postcruise sampling.
Magnetic susceptibility data were the most useful stratigraphic tool for correlation at this site. Natural gamma radiation and CSR data were helpful in intervals where structure in the MS profile was ambiguous.